Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information (USD $)
3 Months Ended
Apr. 28, 2012
May 10, 2012
Jul. 29, 2011
Entity Registrant Name Dollar Tree Inc    
Entity Central Index Key 0000935703    
Current Fiscal Year End Date --02-02    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 7,748,097,313
Entity Common Stock, Shares Outstanding   115,978,199  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q1    
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Apr. 28, 2012